Example usage for java.nio ByteBuffer allocateDirect

Introduction

In this page you can find the example usage for java.nio ByteBuffer allocateDirect.

Prototype

public static ByteBuffer allocateDirect(int capacity) 

Source Link

Document

Creates a direct byte buffer based on a newly allocated memory block.

Usage

From source file:de.bluepair.sci.client.SHAUtils.java

public static <T> Map<String, String> sha512(Path path, Predicate<T> gard, T testValue, long blockSizePref,
        boolean forceBlockSize) {

    if (Files.notExists(path)) {
        return null;
    }//from   w  w w.ja  v  a2s.com
    MessageDigest md = getDigest();
    MessageDigest md1 = getDigest();

    if (!gard.test(testValue)) {
        return null;
    }
    long blockSize = blockSizePref;
    long size = -1;
    try {
        size = Files.size(path);
        if (!forceBlockSize) {// maximal 10 hashsummen
            // sonst hab ich zu viele in der datei
            // stehen!
            while (size / blockSize > 10) {
                blockSize += blockSizePref;
            }
        }

    } catch (IOException e) {
        blockSize = blockSizePref;
        return null;
    }

    Map<String, String> map = new HashMap<>();

    long lastStart = 0;

    long stepDown = blockSize;

    try (final SeekableByteChannel fileChannel = Files.newByteChannel(path, StandardOpenOption.READ);) {

        final ByteBuffer buffer = ByteBuffer.allocateDirect(8192);
        int last;
        do {
            if (!gard.test(testValue) || Files.notExists(path)) {
                return null;
            }
            buffer.clear();
            last = fileChannel.read(buffer);

            buffer.flip();
            md.update(buffer);

            // calc 2checksups
            buffer.flip();
            md1.update(buffer);

            if (last > 0) {
                stepDown -= last;
            }

            // wenn ich ein 100mb netzwerk habe
            // ~ca. 5MB bertragung
            // also bei abbruch kann wiederaufgesetzt werden wenn die summen
            // bekannt sind.
            // ~hnlich Blcke berechen also
            // 0-5 c1
            // 0-10 c2
            // 5-10 c3 ...

            if (stepDown <= 0 || (last <= 0)) {
                long len = (blockSize + Math.abs(stepDown));
                if (stepDown > 0) {
                    // kottektur wenn last <0
                    len = blockSize - stepDown;
                }
                stepDown = blockSize;
                map.put("sha512_" + lastStart + "_" + len, Hex.encodeHexString(md1.digest()));
                lastStart += len;
                md1.reset();
            }

        } while (last > 0);

    } catch (IOException ex) {
        Logger.getLogger(FileAnalysis.class.getName()).log(Level.SEVERE, null, ex);
        return null;
    }

    final byte[] sha1hash = md.digest();
    map.put("sha512", Hex.encodeHexString(sha1hash));
    return map;

}

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From source file:org.apache.hadoop.io.ElasticByteBufferPool.java

@Override
public synchronized ByteBuffer getBuffer(boolean direct, int length) {
    TreeMap<Key, ByteBuffer> tree = getBufferTree(direct);
    Map.Entry<Key, ByteBuffer> entry = tree.ceilingEntry(new Key(length, 0));
    if (entry == null) {
        return direct ? ByteBuffer.allocateDirect(length) : ByteBuffer.allocate(length);
    }/*from www .  ja v  a 2s.com*/
    tree.remove(entry.getKey());
    return entry.getValue();
}

---

From source file:de.spqrinfo.cups4j.operations.IppOperation.java

/**
 * Gets the IPP header//  w w w .  ja va  2 s  .  co  m
 *
 * @param url
 * @param map
 * @return IPP header
 * @throws UnsupportedEncodingException
 */
public ByteBuffer getIppHeader(URL url, Map<String, String> map) throws UnsupportedEncodingException {
    if (url == null) {
        logger.error("IppOperation.getIppHeader(): uri is null");
        return null;
    }

    ByteBuffer ippBuf = ByteBuffer.allocateDirect(bufferSize);
    ippBuf = IppTag.getOperation(ippBuf, operationID);
    ippBuf = IppTag.getUri(ippBuf, "printer-uri", stripPortNumber(url));

    if (map == null) {
        ippBuf = IppTag.getEnd(ippBuf);
        ippBuf.flip();
        return ippBuf;
    }

    ippBuf = IppTag.getNameWithoutLanguage(ippBuf, "requesting-user-name", map.get("requesting-user-name"));

    if (map.get("limit") != null) {
        int value = Integer.parseInt(map.get("limit"));
        ippBuf = IppTag.getInteger(ippBuf, "limit", value);
    }

    if (map.get("requested-attributes") != null) {
        String[] sta = map.get("requested-attributes").split(" ");
        if (sta != null) {
            ippBuf = IppTag.getKeyword(ippBuf, "requested-attributes", sta[0]);
            int l = sta.length;
            for (int i = 1; i < l; i++) {
                ippBuf = IppTag.getKeyword(ippBuf, null, sta[i]);
            }
        }
    }

    ippBuf = IppTag.getEnd(ippBuf);
    ippBuf.flip();
    return ippBuf;
}

---

From source file:org.cloudata.core.commitlog.pipe.BufferPool.java

public ByteBuffer[] getBuffer(int size) {
    ByteBuffer retBuffer = null;//from w w  w  . j  a v a  2 s . com

    synchronized (bufferMap) {
        TreeSet<PoolEntry> entrySet = bufferMap.get(size);

        if (entrySet != null) {
            PoolEntry entry = entrySet.pollLast();
            if (entry != null) {
                retBuffer = entry.buffer;
            }
        }
    }

    if (retBuffer == null) {
        retBuffer = ByteBuffer.allocateDirect(size);
        poolMonitor.increaseAllocated(size);
    } else {
        poolMonitor.increaseUsed(size);
    }

    return new ByteBuffer[] { retBuffer };
}

---

From source file:org.zuinnote.hadoop.bitcoin.format.BitcoinBlockReader.java

/**
* Create a BitcoinBlock reader that reads from the given stream and uses the given parameters for configuration. Note it assumed that the validity of this configuration is checked by BitcoinBlockRecordReader
* @param in Input stream to read from/*from  w w w. jav  a 2 s . c  o m*/
* @param maxSizeBitcoinBlock Maximum size of a Bitcoinblock.
* @param bufferSize size of the memory buffer for the givenInputStream
* @param specificMagicByteArray filters by specific block magic numbers if not null. 
* @param useDirectBuffer experimental feature to use a DirectByteBuffer instead of a HeapByteBuffer
**/

public BitcoinBlockReader(InputStream in, int maxSizeBitcoinBlock, int bufferSize,
        byte[][] specificMagicByteArray, boolean useDirectBuffer) {
    this.maxSizeBitcoinBlock = maxSizeBitcoinBlock;
    this.bufferSize = bufferSize;
    this.specificMagicByteArray = specificMagicByteArray;
    this.useDirectBuffer = useDirectBuffer;
    if (specificMagicByteArray != null)
        this.filterSpecificMagic = true;
    this.bin = new BufferedInputStream(in, bufferSize);
    if (this.useDirectBuffer == true) { // in case of a DirectByteBuffer we do allocation only once for the maximum size of one block, otherwise we will have a high cost for reallocation
        preAllocatedDirectByteBuffer = ByteBuffer.allocateDirect(this.maxSizeBitcoinBlock);
    }
}

---

From source file:me.schiz.jmeter.ring.udp.sampler.UDPRingSampler.java

@Override
public SampleResult sample(Entry entry) {
    boolean idling = false;
    SampleResult newSampleResult = new SampleResult();
    newSampleResult.setSampleLabel(getName());

    ConcurrentLinkedQueue<SampleResult> queue = tlQueue.get();
    if (queue == null) {
        queue = new ConcurrentLinkedQueue<SampleResult>();
        tlQueue.set(queue);//from w w w  . j av  a  2  s. c o m
    }

    Ring ring = UDPRingSourceElement.get(getSource());
    Token t;
    int tid = -1;
    byte[] request_in_bytes = new byte[0];

    ByteBuffer request = tlRequest.get();
    if (request == null) {
        request = tlBuffer.get();
        if (request == null) {
            request = ByteBuffer.allocateDirect(8 * 1024 * 1024);
            tlBuffer.set(request);
        }
        request.clear();

        if (isHex()) {
            try {
                request_in_bytes = Hex.decodeHex(getRequest().toCharArray());
            } catch (DecoderException e) {
                log.error("can't decode request", e);
                idling = true;
            }
        } else {
            request_in_bytes = getRequest().getBytes();
        }
        request.put(request_in_bytes);
    }
    if (!idling) {
        try {
            request.flip();
            while (tid == -1) {
                tid = ring.acquire();
            }
            t = ring.get(tid);
            t.lock.lock();
            if (isHex())
                t.ishex = true;
            newSampleResult.sampleStart();
            try {
                //t.socketChannel.write(request);
                t.sampleResult = newSampleResult;
                t.queue = queue;
                ring.write(tid, request);
                request.clear();
                newSampleResult.setSuccessful(true);
            } catch (IOException e) {
                newSampleResult.setSuccessful(false);
                ring.reset(tid);
                log.warn("IOException", e);
            } finally {
                t.lock.unlock();
            }

        } catch (Exception e) {
            log.error("Exception", e);
            newSampleResult.setSuccessful(false);
            newSampleResult.setResponseCode(e.getClass().getName());
            while (!queue.offer(newSampleResult)) {
            }
            if (tid != -1)
                ring.reset(tid);
        } finally {
            newSampleResult.setRequestHeaders(getRequest());
        }
    }
    SampleResult sampleResult = queue.poll();
    return sampleResult;
}

---

From source file:com.rinke.solutions.pinball.io.UsbConnector.java

@Override
protected void send(byte[] data, ConnectionHandle handle) {
    IntBuffer transfered = IntBuffer.allocate(1);
    ByteBuffer buffer = ByteBuffer.allocateDirect(data.length);
    buffer.put(data);//from   w ww  . j  ava 2  s. c o m
    UsbHandle usb = (UsbHandle) handle;
    // Use device handle here
    int res = LibUsb.bulkTransfer(usb.getDeviceHandle(), (byte) 0x01, buffer, transfered, 4000);
    if (res != LibUsb.SUCCESS)
        throw new LibUsbException("Control transfer failed", res);
    if (transfered.get() != data.length) {
        log.error("unexpected length returned on bulk: {}", transfered.get());
    }
}

---

From source file:org.apache.hadoop.io.compress.lzma.LzmaCompressor.java

/** 
 * Creates a new compressor using the specified level {@link CompressionLevel}.
 * //from  w  ww . ja  v a2s  . c  om
 * @param level lzma compression algorithm to use
 * @param directBufferSize size of the direct buffer to be used.
 */
public LzmaCompressor(int compress_level, int directBufferSize) {
    this.level = compress_level;
    this.directBufferSize = directBufferSize;

    uncompressedDirectBuf = ByteBuffer.allocateDirect(directBufferSize);
    compressedDirectBuf = ByteBuffer.allocateDirect(directBufferSize);
    compressedDirectBuf.position(directBufferSize);

    stream = init(this.level);
}

---

From source file:rb.app.GLObject.java

public void allocateBuffer() {
    int SHORT_MAX = 250000;
    int FLOAT_MAX = 1000000;

    Log.d("GLRenderer", "Allocate (short):" + SHORT_MAX * 2 + " bytes");
    ByteBuffer vbb = ByteBuffer.allocateDirect(SHORT_MAX * 2);
    vbb.order(ByteOrder.nativeOrder());
    _shortBuffer = vbb.asShortBuffer();/*from w  ww.j  a v  a  2s .  com*/
    _shortBuffer.position(0);

    Log.d("GLRenderer", "Allocate (float):" + FLOAT_MAX * 4 + " bytes");
    ByteBuffer fbb = ByteBuffer.allocateDirect(FLOAT_MAX * 4);
    fbb.order(ByteOrder.nativeOrder());
    _floatBuffer = fbb.asFloatBuffer();
    _floatBuffer.position(0);
}

---

From source file:xbird.server.services.RemotePagingService.java

public RemotePagingService() {
    super(SRV_NAME);
    this._fdCacheMap = new FinalizableSoftValueReferenceMap<String, FileChannel>(
            new ReferentFinalizer<FileChannel>() {
                public void finalize(FileChannel reclaimed) {
                    IOUtils.closeQuietly(reclaimed);
                }// www  .j a va 2s .  c  o m
            });
    this._directoryCache = new ReferenceMap<String, IDescriptor>(ReferenceType.STRONG, ReferenceType.SOFT);
    if (SystemUtils.isSendfileSupported()) {
        this._sndBufSegm = null;
        this._sndBufDTM = null;
    } else {
        this._sndBufSegm = ByteBuffer.allocateDirect(SND_BUFSIZE);
        _sndBufSegm.order(ByteOrder.BIG_ENDIAN);
        this._sndBufDTM = ByteBuffer.allocateDirect(SND_BUFSIZE);
        _sndBufDTM.order(ByteOrder.LITTLE_ENDIAN);
    }
}

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